Question

1. Rezolvati ecuatiile:

a. 5(3x-2)+3x-6(8x-13)=16(9-2x)-78

b. 2(3x+4)-5(2x-3)-2=7(2x-4)+2(8-5x)+3x

c. 2(3x-4)+5(6x-7)-3x=9(x+10)+(11(x+12)+8

d. 3(6x-5)-2(4x+3)+13=-2(-4x+9)+2x-5(3x-2)


Va rog

Coroanaa.

Answer 1

a) 5 (3x-2)+3x-6 (8x-13)=16 (9-2x)-78 <=>

15x-10+3x-48x+78=144-32x-78 <=>

-30x+68=66-32x <=> -30x+32x=66-68 <=>

2x= -2 <=>x= -1

b) 2(3x+4)-5(2x-3)-2=7(2x-4)+2(8-5x)+3x <=>

6x+8-10x+15-2=14x-28+16-10x+3x <=>

-4x+21=7x-12 <=> -4x-7x= -12-21 <=> -11x= -33 <=>

11x=33 <=> x=3

c) 2(3x-4)+5(6x-7)-3x=9(x+10)+(11(x+12)+8 <=>

6x-8+30x-35-3x=9x+90+11x+132+8 <=>

33x-43=20x+230 <=> 33x-20x=230+43 <=>

13x=273 <=> x=21

d) 3(6x-5)-2(4x+3)+13=-2(-4x+9)+2x-5(3x-2) <=>

18x-15-8x-6+13=8x-18+2x-15x+10 <=>

10x-8= -5x-8 <=> 10x+5x= -8+8 <=>15x=0 <=> x=0